SPT SU-4010 Ultrasonic

Best ultrasonic humidifier

  • Quiet
  • Variable humidity
  • Produces cool or warm mist
  • No humidistat
  • May leak
  • Some durability problems

Bottom line

The SPT SU-4010 is an excellent option for those looking for a top performing ultrasonic humidifier at an easy to swallow price. It's compact, effective and can emit either cool or warm mist. There aren't too many bells or whistles on this model, but provided you pay close attention while filling its tank, it should satisfy most users' needs.

Breaking it down

Ease of use

Minimal features, but simple and effective. The SPT (formerly Sunpentown) SU-4010 humidifier is an excellent pick for those users who are looking for a straightforward machine with both cool- and warm-mist options. The large control knobs are easy to use, and users praise the SPT's dual nozzles, which rotate 360 degrees to pinpoint where you want the mist to go. Some experts say that cleaning is a chore, but others note that ease of cleaning is above average compared to most ultrasonic humidifiers.

Moisture output

Fine mist, few issues with dust. This ultrasonic model can produce either warm or cool mist, enough to humidify 500 square feet of space. The moisture output can be adjusted with a manual dial, but there is no built-in humidistat. Users say that this humidifier produces plenty of fine mist. Its demineralization cartridge (called the Ion Exchange Filter) seems relatively effective as we saw fewer complaints of dust residue than with other ultrasonic humidifiers, though the SPT SU-4010 is not completely immune from that issue.


A low humming, but otherwise quiet. Most reviewers agree that the SPT SU-4010 is incredibly quiet. It generates a low humming noise when on, but most owners and reviewers say that it is only nominally noticeable.


Some durability concerns. User feedback for the SPT SU-4010 is mixed, but very much in line with most ultrasonic humidifiers, including those that cost twice as much. While most owners are generally happy with the SPT SU-4010 humidifier, questions about durability, and reports of units that failed prematurely, are easy to spot. We also found some owners that noted problems with leaking. Others say this can be easily fixed by simply paying closer attention to the washer when screwing the cap back on (it sometimes can become knocked out of place). The value of the SU-4010 compared to other options comes in for kudos.

Where To Buy
SPT SU-4010 Ultrasonic Dual-Mist Warm/Cool Humidifier with Ion Exchange Filter

 (880 reviews)
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SPT SU-4010 Reviews

1. ConsumerReports.org

ConsumerReports.org has test results for 36 humidifiers, including the SPT SU-4010. The humidifier is rated on its output, ease of use, noise level, energy efficiency and ability to handle hard water. Some user reviews may also be found at this site.

Review: SPT SU-4010, Editors of ConsumerReports.org, Not Dated

2. TheSweetHome.com

The SPT SU-4010 is named a top ultrasonic humidifier for larger rooms in this comparative review that includes hands-on testing. Its output is comparable to the class-leading Air-O-Swiss AOS 7135 but it costs substantially less, editors say. It lacks a humidistat, but the biggest negatives found is that cleaning and refilling the humidifier are harder than they should be.

Review: The Best Humidifier, John Holecek, Jan. 16, 2015

3. BabyGearLab.com

The SPT SU-4010 is the top humidifier at BabyGearLab.com, and named an Editors' Choice. Noise levels and ease of use were judged to be exceptional compared to other humidifiers tested. Performance is also better than most, and the ease of cleaning above average.

Review: Sunpentown SU-4010 Review, Ellen Baker and Editors of BabyGearLab.com, June 14, 2015

4. Amazon.com

The SPT SU-4010 receives an overall rating of 3.6 stars out of 5 from more than 850 users at Amazon.com. Owners say it runs quietly and produces plenty of good, fine mist. Its compact size is also a plus. However, we read several reports of problems with leakage and other mechanical failures. Others point out that taking care that a washer makes a good seal when reseating the tank cap eliminates most leakage issues.

Review: SPT SU-4010 Ultrasonic Dual-Mist Warm/Cool Humidifier with Ion Exchange Filter, Contributors to Amazon.com, As of October 2015

5. Walmart.com

Feedback is a little rosier at Walmart.com. The SPT (formerly Sunpentown) SU-4010 earns a rating of 4.1 stars out of 5 based on feedback from more than 130 owners. Around 81 percent say that they would recommend this ultrasonic humidifier to a friend.

Review: Sunpentown Ultrasonic Dual Mist Warm / Cool Humidifier, Contributors to Walmart.com, As of October 2015

6. AllergyBuyersClub.com

The editors of AllergyBuyersClub.com award the Sunpentown (SPT) SU-4010 a rating of 4 stars out of 5 overall. Its strongest features include its quietness, ease of use and value for price, but it loses points for its flimsy construction and lack of features such as a built-in humidistat. Three users also weigh in, with two being completely pleased.

Review: Sunpentown SU4010 Ultrasonic Dual Mist Humidifiers, Editors and Contributors to AllergyBuyersClub.com, As of October 2015

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